DragonFly On-Line Manual Pages
Tk_FreeXId(3) Tk Library Procedures Tk_FreeXId(3)
Tk_FreeXId - make X resource identifier available for reuse
Display *display (in) Display for which id was allocated.
XID id (in) Identifier of X resource (window, font,
pixmap, cursor, graphics context, or
colormap) that is no longer in use.
The default allocator for resource identifiers provided by Xlib is very
simple-minded and does not allow resource identifiers to be re-used.
If a long-running application reaches the end of the resource id space,
it will generate an X protocol error and crash. Tk replaces the
default id allocator with its own allocator, which allows identifiers
to be reused. In order for this to work, Tk_FreeXId must be called to
tell the allocator about resources that have been freed. Tk
automatically calls Tk_FreeXId whenever it frees a resource, so if you
use procedures like Tk_GetFont, Tk_GetGC, and Tk_GetPixmap then you
need not call Tk_FreeXId. However, if you allocate resources directly
from Xlib, for example by calling XCreatePixmap, then you should call
Tk_FreeXId when you call the corresponding Xlib free procedure, such as
XFreePixmap. If you do not call Tk_FreeXId then the resource
identifier will be lost, which could cause problems if the application
runs long enough to lose all of the available identifiers.
Tk 4.0 Tk_FreeXId(3)